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Browsing Journal Articles by Author "De Lange, Willem J"

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Applying Bayesian modelling to assess climate change effects on biofuel production

Author: Peter, C ; De Lange, Willem J ; Musango, JK ; April, K ; Potgieter, A Date: Dec 2009 Socioeconomic and ecological systems exhibit complex, interdependent behaviour which is often difficult to model and understand. This is due to the complex reorganisation of key sub-system processes involving nonlinear, cross-scale and ... Read more
Beyond GDP: towards a green economy index

Author: Nahman, Anton ; Mahumani, BK ; De Lange, Willem J Date: Feb 2016 Worldwide, there is increasing recognition of the need for countries to pursue a "green economy". Given the broad (economic, social and environmental) objectives of a green economy, and the limitations associated with mainstream measures of ... Read more
Contextualising risk within enterprise risk management through the application of systems thinking

Author: Haywood, Lorren K ; Forsyth, Gregory G ; De Lange, Willem J ; Trotter, Douglas H Date: Jun 2017 New and emerging risks create growing uncertainty and unpredictability within enterprise risk management. While ISO 31000:2009 is a progressive risk management framework, it is limited in its guidance on how to contextualise complex risks. ... Read more
Costs and benefits of biological control of invasive alien plants in South Africa

Author: Van Wilgen, BW ; De Lange, Willem J Date: Aug 2011 This paper provides a brief review of the environmental and economic costs of invasive alien plants in South Africa as a background to assessments of returns on investment in weed biological control. The understanding of impacts and their ... Read more
Costs of food waste along the value chain: evidence from South Africa

Author: Nahman, Anton ; De Lange, Willem J Date: Nov 2013 In a previous paper (Nahman et al., 2012), the authors estimated the costs of household food waste in South Africa, based on the market value of the wasted food, as well as the costs of disposal to landfill. In this paper, we extend the ... Read more
Costs of food waste in South Africa: Incorporating inedible food waste

Author: De Lange, Willem J ; Nahman, Anton Date: Jun 2015 The economic, social and environmental costs of food waste are being increasingly recognised. Food waste consists of both edible and inedible components. Whilst wastage of edible food is problematic for obvious reasons, there are also costs ... Read more
The costs of household food waste in South Africa

Author: Nahman, Anton ; De Lange, Willem J ; Oelofse, Suzanna HH ; Godfrey, Linda K Date: Nov 2012 Food waste is problematic for a number of reasons, including the loss of a potentially valuable food source or resource for use in other processes (e.g. energy generation or composting), wasted resources and emissions in the food supply chain, ... Read more
Economic assessment of the contribution of biological control to the management of invasive alien plants and to the protection of ecosystem services in South Africa

Author: De Lange, Willem J ; Van Wilgen, BW Date: Jul 2010 This study is a first attempt at a holistic economic evaluation of South African endeavours to manage invasive alien plants using biological control. The author’s focus was on the delivery of ecosystem services from habitats that are invaded ... Read more
Environmental and resource economics in South Africa: status quo and lessons for developing countries

Author: Nahman, Anton ; Wise, R ; De Lange, Willem J Date: Sep 2009 The paper reviews the potential contributions of environmental and resource economics (ERE) to the achievement of sustainable development in developing countries and highlights the limitations associated with applying ERE within a developing ... Read more
How do we improve synchronization between land and water reform?

Author: Nortje, Karen ; Funke, Nicola S ; De Lange, Willem J Date: Jul 2014 A completed study initiated, managed and funded by the Water Research Commission (WRC) and led by the CSIR is delving into the successes of land reform and water allocation reform in the Maruleng local municipal area. Read more
Incorporating stakeholder preferences in the selection of technologies for using invasive alien plants as a bio-energy feedstock: applying the analytical hierarchy process

Author: De Lange, Willem J ; Stafford, William HL ; Forsyth, GG ; Le Maitre, David C Date: May 2012 Invasive alien plants (IAPs) impose significant social costs on the population of the Agulhas Plain region in South Africa due to their adverse impacts on ecosystem goods and services (decreased water supply and increased fire risk). While ... Read more
Integrating socio-economic and biophysical data to support water allocations within river basins: an example from the Inkomati Water Management Area in South Africa

Author: De Lange, Willem J ; Wise, RM ; Forsyth, GG ; Nahman, Anton Date: Jan 2010 Sustainable natural resource management requires inputs from both the natural and the social sciences. Since social and natural systems are inter-related and inter-dependent, it is essential that these data can be integrated within a given ... Read more
Legislative challenges hindering mine waste being reused and repurposed in South Africa

Author: Haywood, Lorren K ; De Wet, Benita ; De Lange, Willem J ; Oelofse, Suzanna HH Date: Nov 2019 While the waste hierarchy promotes the reuse of waste there currently remains limited reuse of mine waste in South Africa. Overburden, waste rock, tailings and slag are stockpiled or disposed leading to environmental liabilities including ... Read more
The marginal product value of irrigation water for potato and vine cultivation in the Sandveld region, South Africa

Author: De Lange, Willem J ; Mahumani, BK Date: Dec 2012 The advent of grid electrification in the Sandveld region of South Africa in the 1980s increased the utilisation of groundwater resources for commercial irrigation purposes. In the wake of the consequent increased pressure on the resource, ... Read more
Monetary valuation of salinity impacts and microbial pollution in the Olifants Water Management Area, South Africa

Author: De Lange, Willem J ; Mahumani, BK ; Steyn, Maronel ; Oelofse, Suzanna HH Date: Apr 2012 This paper estimates costs associated with water pollution in the Olifants River Water Management Area (WMA) in South Africa, more specifically the Loskop Dam Water User Association. The authors focus on the impacts of salinisation on commercial ... Read more
Monetary value of the impacts of filamentous green algae on commercial agriculture: Results from two geographically different case studies

Author: De Lange, Willem J ; Botha, AM ; Oberholster, Paul J Date: Jul 2016 This paper presents estimates of the monetary value of the impact of eutrophication (algae) on commercial agriculture in two different catchments in South Africa. A production function approach is applied to estimate the monetary value of the ... Read more
Multi-functional landscapes in semi arid environments: implications for biodiversity and ecosystem services

Author: O'Farrell, Patrick J ; Reyers, B ; Le Maitre, David C ; Milton, SJ ; Egoh, Benis N ; Maherry, A ; Colvin, C ; Atkinson, D ; De Lange, Willem J ; Blignaut, JN ; Cowling, RM Date: Jun 2010 Synergies between biodiversity conservation objectives and ecosystem service management were investigated in the Succulent Karoo biome (83,000 km2) of South Africa, a recognised biodiversity hotspot. Our study complemented a previous biodiversity ... Read more
The possibilities and pitfalls presented by a pragmatic approach to ecosystem service valuation in an arid biodiversity hotspot

Author: O'Farrell, Patrick J ; De Lange, Willem J ; Le Maitre, David C ; Reyers, B ; Blignaut, JN ; Milton, SJ ; Atkinson, D ; Egoh, Benis N ; Maherry, A ; Colvin, C ; Cowling, RM Date: Jan 2011 Arid regions are home to unique fauna, flora, and vulnerable human populations, and present a challenge for sustainable land-use management. The authors undertook an assessment and valuation of three key services, grazing, tourism and water ... Read more
Safeguarding biodiversity and ecosystem services in the Little Karoo, South Africa

Author: Egoh, Benis N ; Reyers, B ; Carwardine, J ; Bode, M ; O'Farrell, Patrick J ; Wilson, KA ; Possingham, HP ; Rouget, M ; De Lange, Willem J ; Cowling, RM Date: Feb 2010 Global declines in biodiversity and the widespread degradation of ecosystem services have led to urgent calls to safeguard both. Responses to this urgency include calls to integrate the needs of ecosystem services and biodiversity into the ... Read more
Securing a sustainable future through a new global contract between rich and poor

Author: De Lange, Willem J ; Wise, RM ; Nahman, Anton Date: 2009 Global sustainable development depends on the capacity of natural, social and economic systems to adapt to external stimuli. However, building this adaptive capacity in the developing world context of Sub-Sahara Africa will require substantial ... Read more

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